export default {
  namespaced: true,
  state: () => ({
    // 购物车状态，包含商品信息
    // goods_id goods_name goods_price goods_count goods_small_logo goods_state
    cart: JSON.parse(uni.getStorageSync('cart') || '[]') // 初始化为空数组
  }),

  mutations: {
    addToCart(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)

      if (!findResult) {
        state.cart.push(goods)
      } else {
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStore')
    },
    saveToStore(state) {
      uni.setStorageSync('cart', JSON.stringify(state.cart))
    },
    updateGoodsState(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_state = goods.goods_state
        // findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStore')
      }
    },
    updateGoodsCount(state, goods) {
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
      if (findResult) {
        findResult.goods_count = goods.goods_count
        // findResult.goods_count = goods.goods_count
        this.commit('m_cart/saveToStore')
      }
    },
    removeGoodsById(state, goods_id) {
      state.cart = state.cart.filter(x => x.goods_id !== goods_id)
      this.commit('m_cart/saveToStore')
    },
    // 更新购物车所有商品的勾选状态
    updateAllGoodsState(state, newState) {
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStore')
    },
    getGoods(state) {
      return state.cart.filter(x => x.goods_state).map(x => ({
        goods_id: x.goods_id,
        goods_number: x.goods_count,
        goods_price: x.goods_price
      }))
    }
  },

  actions: {

  },

  getters: {
    // 购物车所有商品的总数量
    total(state) {
      // let c = 0
      // state.cart.forEach(x => c += x.goods_count)
      // return c

      return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    // 购物车已勾选商品的总数量
    checkedCount(state) {
      return state.cart.filter(x => x.goods_state).reduce((total, item) => total += item.goods_count, 0)
    },
    // 计算已勾选商品的总价格
    checkedGoodsAmount(state) {
      return state.cart.filter(x => x.goods_state)
        .reduce((total, item) => total += item.goods_count * item.goods_price, 0)
        .toFixed(2)
    }
  }
};